Security personnel wait to inspect vehicles entering Norfolk Naval Station in 2004 in Norfolk, Va. Navy tightened rules for base admittance in the Navy Region Mid-Atlantic after a truck driver killed a sailor at Norfolk last week. (AP)

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A week after an ex-convict gained access to Naval Station Norfolk and killed a member of Navy security forces on Pier 1, Navy Region Mid-Atlantic tightened rules for base admittance and placed a gate sentry on leave.

Rear Adm. Dixon Smith, the head of the Navy region, ordered additional screening for all delivery drivers presenting the Transportation Worker Identification Credential, or TWIC, NRMA said in a press release Monday. These rules took effect last week after the shooting, the release said.

All drivers present a TWIC card to get on base to be run through the National Crime Information Center database for criminal histories and outstanding warrants, which will be grounds for denial.

On March 24, the alleged gunman Jeffrey Savage got on base using his TWIC before shooting Master-at-Arms 2nd Class Mark Mayo, the chief of the watch, with a gun he stripped from the petty officer of the watch on board the destroyer Mahan. Savage, who held a valid TWIC, had no authorization to be on base, NCIS said last week.

The Naval Criminal Investigative Service is investigating the shooting as well as a parallel command investigation into the policies, programs and implementation that allowed the shooting to occur.

The gate sentry who allowed Savage access to base has been placed on administrative leave, pending the outcome of the investigation, the release said.

Savage has spent time in prison for selling crack and, separately, for voluntary manslaughter.